Orient, watched by a crowd of 4,321, including 150 away fans, replaced Beall with Houghton on 51 minutes.
Midfielder Martin fired a low 15-yard shot straight at Brock on 53 minutes. Scott Stamps was booked for a bad tackle on speedy Orient striker McLean, who then went off
Foster gained some space in the box for Harriers three minutes later but wastefully struck the ball too close to Barrett at his near post with Broughton waiting in the middle.
Sall was the first player to be booked on 58 minutes for a foul and the home side equalised on the hour when Minton crashed home a superb 20-yarder after Hinton had headed Jones' corner away to the edge of the box.
Rattled Harriers had Stamps booked on 63 minutes for a bad tackle on nippy striker McLean. The Orient forward came off a minute later with Tate taking his place.
Broughton was cautioned for a 68th minute lunge on Houghton.
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